Abstract：More than 98% purity of trans-4-(trans-4′-n-propylcyclohexyl)cyclohexyl aldehyde was obtained via hydrogenation,acidolysis and isomerization reaction with trans-4-(4′- n-propylcyclohexyl)-benzaldehyde propylene glycolacetal as the starting material, the total yield was 39.2%, the structure of the target compound was confirmed by 1HNMR, IR and GC-MS. The hydrogenation reaction conditions of trans-4-(4′-n-propylcyclohexyl)-benzaldehyde propylene glycolacetal were investigated,the results of the condition experiments showed that the reaction effect was best when Ru/C was as the catalyst, ethanol was as the reaction solvent,m[trans-4-(4′- n-propylcyclohexyl)-benzaldehyde propylene glycolacetal]:m(Ru/C) was 1 g : 0.09 g,the hydrogenation pressure was 3.5 MPa,the reaction temperature was 35～40 ℃.